State officials have cleared three guards of accusations that they incited violence among girls held at a Rome juvenile detention facility. One of the guards was fired, though, for failing to prevent a Dec. 7 attack, and the other two were disciplined for unrelated policy violations. Some girls in the facility said they believed guards were complicit in some violence, but officials said the guards passed polygraph exams and “the totality of witness statements and information” did not support the charges.